Improved bueglae-alaem



CHRISTIAN KNISELY, "O-F oHIe'Ae'o ILLINOIS.

Letters Patent No. 75,771,. dated March 24,1868.

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T0. wHo I'r MAY eonennm 'Be it known that I, C. KNISELY, of the city of Chicago, in: the county of Cook, and State of Illinois, have invented certain new and useful Improvements in Burglar-Alarms; and I do hereby declare that the following is a clear and exact description of the same, reference being had to the accompanying drawings, and the letters of eference-marked thereon.

v To enable others skilled in the art tomake and use my invention, I will proceed to describeits construction and operation.

' Thenature and object ofmy invention are to provide a simple and efficient mechnnism, 1that travellers and others can attach to any door, and when said door is opened, or attempted to be opened, an alarm will be given that'will awaken the per'son sleeping in the room.

a is the frame or body to which 'areattached the operative of my mechanism, with a'slot cut through it,

through which the springpasses. b is a spring attached at one end to the frame a, and the other end terminating i'n thehammer e, the spring 6 and hammer a forming one and the same piece of metal. dis a small pistolbarrel attached to the upper endof the frame at, extending through it,,and terminating on the other side in a cap-stand, and upon which an ordinary percussion-cap can be placed, and against which the hammer d strikes. e is a spring permanently fastened at the lower end to the armf. The armfis screwed to the frame a. gis a piston or rod, workingthrough a hole in the arm f, and working up under the spring'e. At the lower end of the piston-g is a thumb-nut, 2', working or screwing on this piston. 1 7c is a point which enters the door-post, to holdthe mechanism in position when in use. p i

The operation ofmy invention is as follows: The arm f'is unscrewed from the frame a; the thin end of the frame is then placed against the door-post, and thepoint k is inserted into the door-post; the door is then closed, the frame a coming between the door. and the post; thearm'f is then screwed into the frame a, and as the door is opened, or attempted to be opened, it comes against the thumb-nut a, which drives the piston g-forward and unclasps the hammer from. the spring e, to which it'has been locked before the alarm has been applied to use. The action of the spring causes the hammer to strike with great force againstthe cap-stand, causing the. I cap to explode.

The red line in the drawings indicates the position of the hammer when drawn back and locked withithe spring e. The thumb-hut i is adjusted at pleasure on the piston g, so that the door strikes it sooner or laterr I can employ other methods for creating an'alarIn-than a pistol. A wire leading froma bell could be attached to the hammer d, and cause a violent ringing ofthe bell; -hut for travel ers the pistol will be found the most convenient. I I i I p v I Having thus described my invention, whatl claim as new, 'anddesire to secure by Letters Patent, is-

1. Combining the spring .6 and hammer c, constructed, in"a single piece, with the stationarypistol-barrel d, all arranged as described. I

'2. Combining the piston'g, hammer and spring a, substantially in the manner shown.

3. Adjusting the pistong by means of the thumb-nut z, substantially as shown.

4. In a burglar-alarmpthe;combination of the pistol-barrel d, hammer a, spring b, piston 51, springe, and

. thumb-piece i, all arranged and constructed as described.

- CHRISTIAN KNIS'ELY; Witnesses:

Jns. A. COWLES, QANL Faneuson. 

